HARRISBURG, PENNSYLVANIA / RankWire.AI / – As of 2026, Pennsylvania has documented a total of 943 confirmed measles cases spanning 39 counties. The latest update from the state also indicates there have been 176 hospitalizations and five deaths linked to measles since the beginning of the year, with data through Sept. 30. The Pennsylvania Department of Health continues to monitor the outbreak by tracking infection rates, vaccination statuses, hospitalizations, and fatalities.
The fifth death associated with measles involved a resident of Lancaster County who had not been vaccinated and tested positive for the virus. Officials did not release additional personal information to respect privacy. All five measles-related deaths in Pennsylvania this year involved individuals who were unvaccinated. These fatalities have been officially reported through established public health channels as part of ongoing national surveillance efforts.
Analysis of vaccination records reveals that only four of the confirmed cases in Pennsylvania involved individuals who had received vaccinations appropriate for their age. This group includes three adults and one child from Centre, Jefferson, Lancaster, and Lycoming counties. These four cases account for less than 1% of the total confirmed cases in the state. Health authorities continue to recommend that individuals without documented protection seek advice from healthcare professionals regarding the measles, mumps, and rubella (MMR) vaccine.
Pennsylvania Experiences Significant Rise in MMR Vaccination Rates
The demand for the MMR vaccine has surged as Pennsylvania responds to the ongoing outbreak. Healthcare providers administered over 53,000 doses in September, a sharp increase from the usual monthly total of around 25,000 doses. During August, providers also distributed more than 49,000 doses. Since late April, over 5,500 doses have been given at 180 pop-up clinics organized by state health officials to curb the spread of the virus.
The MMR vaccine offers protection against measles, mumps, and rubella. According to federal guidelines, two doses of the vaccine confer 97% immunity against measles, while a single dose provides 93% protection. Generally, individuals with two documented doses are considered protected and do not require additional shots for routine immunity. Adults who lack clear vaccination records or have only received one dose should consult with a healthcare professional to evaluate their vaccination status.
Measles Cases Rise Nationally in 2026
Measles spreads primarily through airborne transmission, especially when an infected individual coughs, sneezes, or exhales. The virus can remain infectious in the air and on surfaces for up to two hours. Typical symptoms include fever, cough, runny nose, and red or watery eyes. A rash generally appears several days later, often starting on the head. Symptoms can develop between seven and 21 days after exposure, and infected individuals can transmit the virus before the rash shows up.
Pennsylvania’s ongoing outbreak is part of a broader national increase in measles activity observed during 2026. The Centers for Disease Control and Prevention reported 3,659 cases nationwide as of Sept. 24. This figure covers 47 reporting jurisdictions and includes infections among international visitors. Approximately 95% of these cases are linked to outbreaks. During all of 2025, the United States recorded a total of 2,289 confirmed measles cases.